Freelander 1 TD4 question

Good afternoon everyone,
Just in the process of rebuilding the Bosch injection pump on my 54 td4 freebie after finding the drip drip of diesel from underneath, I've changed all the seals, two of which look like they have been degraded by some chemical reaction on their lower surface edge.
Is it imperative to change the two larger green o rings that go on the central cam? Any advice please.

Welcome to the forum

This ere section is for introductions only. Yer best to post technical questions int Freelander section over ere for a betterer response:

https://www.landyzone.co.uk/forum/land-rover-freelander.9/

Hippo said:

Welcome to the forum

This ere section is for introductions only. Yer best to post technical questions int Freelander section over ere for a betterer response:

https://www.landyzone.co.uk/forum/land-rover-freelander.9/

Click to expand...

Thanks Lord Hippo, still trying to nav the site, much appreciated